/* ════════════════════════════════════════════════
   CSS-Variablen & Reset
   ════════════════════════════════════════════════ */
:root {
  --blue:        #29385c;
  --orange:      #fb9049;
  --bg:          #f5f7fb;
  --paper:       #ffffff;
  --text:        #1f2430;
  --muted:       #667085;
  --line:        #dde3eb;
  --soft-blue:   #eef2f8;
  --soft-orange: #fff3ea;
  --soft-green:  #eef7f1;
  --soft-yellow: #fff8eb;
  --soft-red:    #fff1f2;
  --sidebar-w:   280px;
  --sidebar-collapsed-w: 52px;
}
* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
h1,h2,h3,h4,h5,h6 { hyphens: auto; overflow-wrap: break-word; }
body {
  margin: 0;
  background: var(--bg);
  color: var(--text);
  font: 16px/1.78 "IBM Plex Sans","Helvetica Neue",Arial,sans-serif;
}
a { color: var(--blue); text-decoration: none; }
a:hover { text-decoration: underline; }

/* ════════════════════════════════════════════════
   Layout: Sidebar + Main
   ════════════════════════════════════════════════ */
.layout {
  display: grid;
  grid-template-columns: var(--sidebar-w) minmax(0,1fr);
  gap: 24px;
  padding: 22px;
  max-width: 1800px;
  margin: 0 auto;
  transition: grid-template-columns .22s ease;
}
/* Collapsed state */
.layout.sidebar-collapsed {
  grid-template-columns: var(--sidebar-collapsed-w) minmax(0,1fr);
}

/* ── Sidebar ── */
.sidebar {
  position: sticky;
  top: 22px;
  align-self: start;
  background: var(--blue);
  color: #fff;
  border-radius: 18px;
  overflow: hidden;
  transition: width .22s ease;
  width: var(--sidebar-w);
}
.layout.sidebar-collapsed .sidebar {
  width: var(--sidebar-collapsed-w);
}

/* Toggle button – always visible */
.sidebar-toggle {
  display: flex;
  align-items: center;
  justify-content: flex-end;
  padding: 14px 14px 0;
}
.btn-toggle {
  appearance: none;
  border: 1px solid rgba(255,255,255,.22);
  background: rgba(255,255,255,.08);
  color: #fff;
  border-radius: 8px;
  width: 30px; height: 30px;
  cursor: pointer;
  font-size: 16px;
  display: flex; align-items: center; justify-content: center;
  transition: background .15s;
  flex-shrink: 0;
}
.btn-toggle:hover { background: rgba(255,255,255,.18); }

/* Sidebar inner content – hidden when collapsed */
.sidebar-inner {
  padding: 12px 18px 22px;
  overflow: hidden;
}
.layout.sidebar-collapsed .sidebar-inner {
  display: none;
}

/* Collapsed icon column */
.sidebar-icons {
  display: none;
  flex-direction: column;
  align-items: center;
  gap: 10px;
  padding: 10px 0 18px;
}
.layout.sidebar-collapsed .sidebar-icons {
  display: flex;
}
.icon-link {
  display: flex; align-items: center; justify-content: center;
  width: 34px; height: 34px; border-radius: 8px;
  background: rgba(255,255,255,.08);
  color: #fff; font-size: 15px; text-decoration: none;
  transition: background .12s;
}
.icon-link:hover { background: rgba(255,255,255,.2); text-decoration: none; }
.icon-link.current { background: var(--orange); }
.icon-sep { width: 24px; height: 1px; background: rgba(255,255,255,.18); }

.brand h1 { margin: 0 0 8px; font-size: 17px; line-height: 1.25; }
.brand p   { margin: 0; color: #d9e0f0; font-size: 13px; line-height: 1.5; }

.page-links { display: grid; gap: 8px; margin: 18px 0; }
.page-links a {
  display: block; padding: 10px 12px; border-radius: 10px;
  background: rgba(255,255,255,.08); color: #fff; font-weight: 700; font-size: 14px;
}
.page-links a.current { background: var(--orange); color: #1f2430; }

.nav-title {
  margin: 18px 0 10px;
  font-size: 11px; text-transform: uppercase; letter-spacing: .07em; color: #d9e0f0;
}
.sidebar nav a {
  display: block; color: #eaf0fa; padding: 9px 10px;
  border-radius: 9px; font-size: 13px; line-height: 1.35; margin-bottom: 5px;
}
.sidebar nav a:hover,
.sidebar nav a.current { background: rgba(255,255,255,.12); color: #fff; text-decoration: none; }

.sidebox {
  margin-top: 20px; padding: 14px; border-radius: 12px;
  background: rgba(255,255,255,.08); font-size: 12px; line-height: 1.55;
}
.tools { display: flex; flex-direction: column; gap: 7px; margin-top: 16px; }
button.btn {
  appearance: none; border: 1px solid rgba(255,255,255,.24); background: transparent;
  color: #fff; border-radius: 8px; padding: 8px 10px;
  font: 600 13px/1.2 "IBM Plex Sans",sans-serif; cursor: pointer; text-align: left;
}
button.btn:hover { background: rgba(255,255,255,.12); }
button.btn.primary { background: var(--orange); color: #1f2430; border-color: var(--orange); }

/* ── Main ── */
.main { min-width: 0; }

/* ════════════════════════════════════════════════
   Handreichung components
   ════════════════════════════════════════════════ */
.hero, .section {
  background: var(--paper); border: 1px solid var(--line); border-radius: 20px;
}
.hero { padding: 40px 44px; margin-bottom: 28px; }
.hero h2 { margin: 0 0 12px; font-size: 32px; line-height: 1.1; color: var(--blue); }
.hero p   { margin: 8px 0 0; max-width: 1100px; color: var(--muted); }
.section  { padding: 38px 42px 46px; margin-bottom: 28px; scroll-margin-top: 26px; }
.section h3 { margin: 0 0 18px; font-size: 28px; line-height: 1.2; color: var(--blue); }
.section h4 { margin: 38px 0 14px; font-size: 20px; line-height: 1.3; color: var(--blue); }
.section h5 { margin: 0 0 9px; font-size: 16px; line-height: 1.35; }
.section p  { margin: 11px 0; text-align: justify; }
.section p + p { margin-top: 14px; }

.lead {
  border-left: 5px solid var(--orange); background: var(--soft-orange);
  padding: 16px 18px; border-radius: 0 12px 12px 0; margin: 14px 0 24px;
}
.note,.good,.alt,.warn { border: 1px solid var(--line); border-radius: 14px; padding: 16px 18px; margin: 18px 0; }
.note  { background: var(--soft-blue); }
.good  { background: var(--soft-green); }
.alt   { background: var(--soft-yellow); }
.warn  { background: var(--soft-red); }

.grid-2,.grid-3,.tiers,.section-map { display: grid; gap: 22px; }
.grid-2 { grid-template-columns: 1fr 1fr; }
.grid-3,.tiers,.section-map { grid-template-columns: repeat(3,1fr); }

.card,.panel { border: 1px solid var(--line); border-radius: 14px; background: #fff; padding: 20px; }
.label {
  display: inline-block; padding: 4px 9px; border-radius: 999px;
  font-size: 11px; font-weight: 700; background: var(--soft-blue); color: var(--blue); margin-bottom: 9px;
}
.label.orange { background: var(--soft-orange); color: #8c4b13; }
.label.green  { background: var(--soft-green);  color: #25663e; }
.label.yellow { background: var(--soft-yellow); color: #8a5c00; }
.label.red    { background: var(--soft-red);    color: #8c2d3b; }

.section-map { margin: 10px 0 28px; }
.section-map a {
  display: block; border: 1px solid var(--line); border-radius: 14px;
  background: #fff; padding: 18px 20px; color: var(--text); font-weight: 600; min-height: 90px;
}
.section-map a small { display: block; color: var(--muted); margin-top: 5px; font-weight: 400; }

ul,ol { margin: 11px 0 11px 20px; }
details { border: 1px solid var(--line); border-radius: 14px; padding: 14px 16px; margin: 18px 0; background: #fff; }
summary { cursor: pointer; font-weight: 700; color: var(--blue); }

.checklist { list-style: none; margin: 8px 0 0; padding: 0; }
.checklist li { display: flex; gap: 9px; align-items: flex-start; border-top: 1px solid var(--line); padding: 11px 0; }
.checklist li:first-child { border-top: none; }
.checklist input { width: 15px; height: 15px; margin-top: 4px; accent-color: var(--orange); }

.split { display: grid; grid-template-columns: minmax(0,1.9fr) minmax(280px,1fr); gap: 28px; align-items: start; margin-top: 20px; }
.aside-stack { display: grid; gap: 16px; }
.explain {
  border: 1px solid var(--line); border-radius: 16px; padding: 18px;
  background: linear-gradient(180deg,#fff 0%,#f8fbff 100%);
  box-shadow: 0 1px 0 rgba(41,56,92,.04);
}
.explain .kind {
  display: inline-block; padding: 3px 7px; border-radius: 999px;
  font-size: 10px; font-weight: 700; letter-spacing: .01em;
  background: var(--soft-blue); color: var(--blue); margin-bottom: 8px;
}
.explain.emph { background: linear-gradient(180deg,#fff8f3 0%,#fff 100%); }
.explain.emph .kind { background: var(--soft-orange); color: #8c4b13; }
.explain.warnish { background: linear-gradient(180deg,#fff7f7 0%,#fff 100%); }
.explain.warnish .kind { background: var(--soft-red); color: #8c2d3b; }

.section > * + .split, .section > * + .grid-2, .section > * + .grid-3,
.section > * + .tiers, .section > * + .section-map, .section > * + table,
.section > * + details, .section > * + .note, .section > * + .good,
.section > * + .warn, .section > * + .alt { margin-top: 22px; }

.structure-cards { display: grid; grid-template-columns: repeat(2,minmax(0,1fr)); gap: 16px; margin: 18px 0 26px; }
.structure-card  { display: flex; gap: 12px; border: 1px solid var(--line); border-radius: 14px; padding: 14px 16px; background: #fff; align-items: flex-start; }
.structure-card .num { flex: 0 0 auto; width: 30px; height: 30px; border-radius: 50%; background: var(--soft-orange); color: #8c4b13; font-weight: 700; display: flex; align-items: center; justify-content: center; font-size: 13px; }
.structure-card h5 { margin: 0 0 5px; font-size: 15px; line-height: 1.35; color: var(--blue); }
.structure-card .question { margin: 0; font-weight: 500; }
.structure-card .function  { margin: 3px 0 0; font-size: 13px; color: var(--muted); }
.structure-card .content p { text-align: left; }

.pair-cards,.triple-cards { display: grid; gap: 12px; margin: 18px 0 26px; }
.pair-card,.triple-card { border: 1px solid var(--line); border-radius: 14px; background: #fff; overflow: hidden; }
.pair-card   { display: grid; grid-template-columns: minmax(200px,.95fr) minmax(0,1.35fr); }
.triple-card { display: grid; grid-template-columns: minmax(160px,.8fr) minmax(0,1.1fr) minmax(0,1.1fr); }
.pair-card-head,.triple-card-head { background: #f4f6f9; }
.pair-left,.pair-right,.triple-col { padding: 12px 14px; line-height: 1.55; }
.pair-card-head .pair-left,.pair-card-head .pair-right,.triple-card-head .triple-col { font-weight: 700; }
.pair-card .pair-left,.triple-card .triple-col:first-child { color: var(--blue); }
.pair-card .pair-right,.triple-card .triple-col:not(:first-child) { border-left: 1px solid var(--line); }

.figure-diagram { background: #fff; border: 1px solid var(--line); border-radius: 16px; padding: 18px; }
.figure-image   { display: block; width: 100%; max-width: 1000px; height: auto; margin: 0 auto; }
figcaption { margin-top: .9rem; }
.footer    { font-size: 13px; color: var(--muted); }

.footnotes { margin-top: 2rem; padding-top: .9rem; border-top: 1px solid #d7dbe2; font-size: .92rem; line-height: 1.55; color: #3a4656; }
.footnotes p { margin: 0 0 .8rem 0; }
.footnotes sup { font-size: .8em; font-weight: 600; vertical-align: top; }
.footnotes a { color: #2d5b9f; }
.footnotes a:hover { text-decoration: underline; }
sup a { text-decoration: none; font-weight: 600; }

.subhead { margin: 1.25rem 0 .4rem; font-size: 1rem; line-height: 1.35; font-weight: 600; color: #2f3a4a; letter-spacing: .01em; }
.subhead::before { content:""; display:block; width:28px; height:2px; background:var(--orange); opacity:.65; margin-bottom:.4rem; margin-top:1.25rem; border-radius:999px; }

/* ════════════════════════════════════════════════
   Responsive breakpoint
   ════════════════════════════════════════════════ */
@media (max-width: 1100px) {
  .layout { grid-template-columns: 1fr !important; padding: 16px; }
  .sidebar { position: relative; top: auto; width: 100% !important; }
  .layout.sidebar-collapsed .sidebar { width: 100% !important; }
  .layout.sidebar-collapsed .sidebar-inner { display: block; }
  .layout.sidebar-collapsed .sidebar-icons  { display: none; }
  .grid-2,.grid-3,.tiers,.section-map,.split,.structure-cards { grid-template-columns: 1fr; }
  .pair-card,.triple-card { grid-template-columns: 1fr; }
  .pair-card .pair-right,.triple-card .triple-col:not(:first-child) { border-left: none; border-top: 1px solid var(--line); }
  .hero { padding: 24px; }
  .section { padding: 24px 24px 30px; }
}

/* ════════════════════════════════════════════════
   Print – Handreichung
   ════════════════════════════════════════════════ */
@media print {
  * { box-sizing: border-box; }
  html { font-size: 11pt; }
  body { background: #fff !important; color: #000 !important; }
  .sidebar,.sidebar-toggle { display: none !important; }
  .layout { display: block !important; max-width: none !important; padding: 0 !important; }
  .main { width: 100% !important; }

  .hero { border: none !important; border-radius: 0 !important; padding: 0 0 16pt !important; margin-bottom: 0 !important; border-bottom: 2pt solid #29385c !important; }
  .hero h2 { font-size: 20pt !important; color: #29385c !important; }
  .hero p  { color: #444 !important; font-size: 10pt !important; }

  .section { border: none !important; border-radius: 0 !important; padding: 16pt 0 10pt !important; margin-bottom: 0 !important; border-bottom: 1pt solid #dde3eb !important; break-inside: avoid-page; }
  .section h3 { font-size: 14pt !important; color: #29385c !important; margin: 0 0 8pt !important; break-after: avoid; }
  .section h4 { font-size: 11pt !important; color: #29385c !important; margin: 12pt 0 5pt !important; break-after: avoid; }
  .section h5,.subhead { font-size: 9.5pt !important; margin: 8pt 0 3pt !important; break-after: avoid; }
  .section p { margin: 3pt 0 !important; }

  .split,.grid-2,.grid-3,.tiers,.section-map,.structure-cards,.pair-cards,.triple-cards { display: block !important; }
  .aside-stack { margin-top: 8pt !important; display: flex !important; flex-wrap: wrap !important; gap: 5pt !important; }
  .explain { border: 1pt solid #dde3eb !important; border-radius: 5pt !important; padding: 5pt 8pt !important; font-size: 8pt !important; flex: 1 1 45% !important; break-inside: avoid !important; background: #f8faff !important; -webkit-print-color-adjust: exact; print-color-adjust: exact; }
  .explain .kind { font-size: 7pt !important; background: #e8eef8 !important; -webkit-print-color-adjust: exact; print-color-adjust: exact; }
  .panel { border: 1pt solid #dde3eb !important; border-radius: 5pt !important; padding: 7pt 10pt !important; margin-bottom: 6pt !important; break-inside: avoid !important; font-size: 9pt !important; }
  .pair-card,.triple-card { display: grid !important; border: 1pt solid #dde3eb !important; border-radius: 3pt !important; margin-bottom: 4pt !important; font-size: 8.5pt !important; break-inside: avoid !important; }
  .pair-card { grid-template-columns: 1fr 1.4fr !important; }
  .triple-card { grid-template-columns: .9fr 1fr 1fr !important; }
  .pair-card-head,.triple-card-head { background: #f0f2f5 !important; -webkit-print-color-adjust: exact; print-color-adjust: exact; }
  .pair-left,.pair-right,.triple-col { padding: 4pt 7pt !important; font-size: 8pt !important; }
  .structure-card { border: 1pt solid #dde3eb !important; border-radius: 4pt !important; padding: 6pt 9pt !important; margin-bottom: 5pt !important; break-inside: avoid !important; display: flex !important; gap: 7pt !important; }
  .warn,.good,.note,.alt { border-left: 3pt solid #fb9049 !important; background: #fff8f3 !important; padding: 5pt 8pt !important; font-size: 8.5pt !important; border-radius: 0 3pt 3pt 0 !important; break-inside: avoid !important; -webkit-print-color-adjust: exact; print-color-adjust: exact; }
  .good { border-left-color: #27a862 !important; background: #f0faf4 !important; }
  .label { font-size: 7.5pt !important; padding: 1pt 5pt !important; -webkit-print-color-adjust: exact; print-color-adjust: exact; }
  details { border: none !important; padding: 0 !important; }
  details summary { display: none !important; }
  details > * { display: block !important; }
  .section-map { display: none !important; }
  .lead { font-size: 10pt !important; border-left: 2pt solid #fb9049 !important; padding-left: 9pt !important; margin-bottom: 9pt !important; }
  .figure-diagram { border: 1pt solid #dde3eb !important; padding: 9pt !important; border-radius: 5pt !important; break-inside: avoid !important; }
  .figure-image { max-width: 75% !important; }
  .footnotes { font-size: 7.5pt !important; border-top: 1pt solid #aaa !important; padding-top: 5pt !important; margin-top: 12pt !important; }
  .footer { font-size: 7.5pt !important; color: #666 !important; }
  #sec-1,#sec-2,#sec-3,#sec-4 { break-before: page; }
  #intro { break-before: avoid; }
  a[href^="http"]::after { content:" (" attr(href) ")"; font-size: 7pt; color: #666; word-break: break-all; }
  a[href^="#"]::after { content: "" !important; }
  @page { size: A4 portrait; margin: 16mm 15mm 16mm 16mm; }
}